Transcription

4 Why and where was created? OpenFlow started as a way for researchers to do experiments in production networks. Created by Stanford University Provides flexibility and performance - researchers find it to be a very useful experimental platform for all kinds of networking research Daniel Turull - Netnod spring meeting

14 What can you not do with OpenFlow ver1.1 Non-flow-based (per-packet) networking - ex. Per-packet next-hop selection (in wireless mesh) - yes, this is a fundamental limitation - BUT OpenFlow can provide the plumbing to connect these systems Use all tables on switch chips - yes, a major limitation (cross-product issue) - BUT an upcoming OF version will expose these New forwarding primitives - BUT provides a nice way to integrate them through extensions Daniel Turull - Netnod spring meeting

15 What can you not do with OpenFlow ver1.1 New packet formats/field definitions - BUT a generalized OpenFlow (2.0) is on the horizon Optical Circuits - BUT efforts underway to apply OpenFlow model to circuits Low-setup-time individual flows - BUT can push down flows proactively to avoid delays Daniel Turull - Netnod spring meeting

20 Control Program Control program operates on view of network - Input: global network view (graph/database) - Output: configuration of each network device Control program is not a distributed system - Abstraction hides details of distributed state Daniel Turull - Netnod spring meeting

21 Forwarding Abstraction Purpose: Abstract away forwarding hardware Flexible - Behavior specified by control plane - Built from basic set of forwarding primitives Minimal - Streamlined for speed and low-power - Control program not vendor-specific OpenFlow is an example of such an abstraction Daniel Turull - Netnod spring meeting

Software Defined Networking What is it, how does it work, and what is it good for? slides stolen from Jennifer Rexford, Nick McKeown, Michael Schapira, Scott Shenker, Teemu Koponen, Yotam Harchol and David

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Software Defined Networking What is it, how does it work, and what is it good for? Many slides stolen from Jennifer Rexford, Nick McKeown, Scott Shenker, Teemu Koponen, Yotam Harchol and David Hay Agenda

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